Incutex Audio Y cable 3.5 mm stereo jack to 2 x 3.5 mm jack coupling Headphone Adapter (Electronics)
for this price (3.50 euros approximately) you can not complain about the result. The Y-cable has been used so far to infect the iPhone by 2 sets headphones: the sound, etc. has teamed up with the - admittedly not the highest quality, but quite decent